Train Smarter.
Race Better.
Data-driven tools to dial in your nutrition, pacing, and race day strategy.
Even Splits Lab is where endurance training meets real numbers. Our articles break down how to train, fuel, and race smarter, with simple calculators to dial in your pacing, nutrition, sweat rate, and heart rate zones. Built for runners, cyclists, and triathletes who want data they can actually use.
The Lab Tools
Fuel Strategy
Running a half marathon? Most athletes need 60–90g of carbs per hour. Find your exact number in 2 minutes.
Plan Fuel
Sweat Rate
Lose more than 1L of fluid per hour without knowing it? Most athletes do. Find your hourly sweat rate in 2 minutes.
Run Test
Pacing Strategy
Want to run a sub-2:00 half? You need to hold 5:41/km. Enter your goal time and find the pace you actually need to hit.
Find Your Pace
HR Zone Finder
Training in Zone 2 but actually running in Zone 3? It happens more than you’d think. Get your personal zones in 2 minutes.
Find Your ZonesLatest From the Lab
Zone 2 Running vs. Cycling: Why Your HR Doesn’t Match
Plenty of triathletes set one zone 2 heart rate and use it everywhere: same number on the bike, same number on the run, same number for every easy session in between. Then the ride feels suspiciously comfortable while the legs burn out before the watch says anything, or the recovery run somehow drifts ten beats […]
Best Triathlons in the World (That Aren’t Ironman or T100)
Ironman gets the marketing budget. T100 gets the highlight reel and the pro prize money. But some of the most legendary races in the sport happen well outside either series, and if you’ve read our breakdown of T100 vs 70.3, you already know these branded tours don’t own triathlon, they just own the marketing. Once […]
Zone 2 Myths: What the Research Actually Says
Zone 2 has had a strange couple of years. It went from a training zone triathletes used quietly to a thing longevity podcasters talk about like it’s a supplement. Somewhere in that jump, a few claims got repeated so often they started sounding like settled fact. Some of them are not. I went through the […]